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In the laboratory, endothermic reactions are generally performed at elevated temperatures, while exothermic reactions are generally preformed at lower temperatures. Explain what are some possible reasons for this?
Calculate the entropy change for vaporization of 18 g of H2O. The molar enthalpy of vaporization for water is 44 kJ/mol and the boiling point
To prepare 5.0 L of a 3.50 M solution of Potassium Hydroxide (KOH), how many grams of Potassium Hydroxide must be used?
1 Liter H2O with a pH of 7. How much acetic acid (C2H4O2 with K=1.8 x 10^-5 and M.W. of 60.05g/mole) needs to be added to lower the pH of the water to 3
(a) Calculate the standard molar enthalpy change (deltaHrxn°) at 400 K (not 298 K) for the following reaction (the cyclotrimerization of ethyne to benzene)
How to Name and Define Acids, How can you know that HNO3 is nitric acid and HNO2 is nitrous acid? How do you know the difference in endings?
Use the data given to calculate an overall energy change (in kilojoules per mole) for the formation of CsF2 from its elements.
What is the velocity of a hydrogen molecule after absorbing a photon @ 58.4 nm. what is the translational energy of the molecule in J mol-1
What is the total volume of gaseous products, measured at 332°C and 732 torr, when an automobile engine burns 100. g C8H18 (a typical component of gasoline)? Answer needs to be in Liters
Consider the reaction of SO3 in equilibrium with SO2 and O2,shown below. What will happen to the equilibrium if the temperature of the reaction is decreased
PCBs are transported through the environment in the vapor phase to Lake Superior. Let's assume that the flux to this lake is almost all due to rainfall, which has an average PCB concentration of 30 ng/L. The average depth of Lake Superior is 150 m..
26.0 grams of an unknown sugar was dissolved in water and the final volume of the solution was brought up to 1.00 L. The osmotic pressure of this solution was determined to be 3.53 atm at 25°C. Which of the sugars below was most likely the unknown..
Sodium carbonate can be made by heating sodium bicarbonate: 2NaHCO3(s) = Na2CO3(s) + CO2(gas) + H2O(gas) Given that for this reaction delta H = 135.5 KiloJoules and delta G = 33.1 KiloJoules at 25 degrees C, at what temperature will the reaction b..
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